Implantable lead for measuring physiologic information
a technology of physiologic information and implantable leads, which is applied in the field of implantable leads, can solve the problems of inaccurate voltage transmission of piezoelectric sensors, low signal-to-noise ratio of piezoelectric sensors, and the imd battery life is consumed,
Active Publication Date: 2012-06-26
PACESETTER INC
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- Application Information
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Problems solved by technology
However, a major drawback to using strain gauges to measure coronary pressure is that the strain gauge requires that an electrical potential be maintained across the wires, which consumes battery life of the IMD.
However, one drawback to using the piezoelectric strip to measure coronary pressure occurs because the piezoelectric sensors detect many different forces at the same time, such as lateral forces, shear forces, bending forces and rotational forces.
Because many different forces are simultaneously detected, the voltage transmitted by the piezoelectric sensor may be inaccurate.
Another drawback to using the piezoelectric strips to measure coronary pressure is that the voltage generated by the piezoelectric sensor typically have a very low signal to noise ratio.
Method used
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[0014]FIG. 1 illustrates an implantable sensor system 10 formed in accordance with an exemplary embodiment. The sensor system 10 may be used, for example, for generally monitoring a physiological condition of a patient's heart 12, e.g., monitoring cardiac pressure or motion. The system 10 includes a load detection assembly 14, an attachment device 16 for positioning the load detection assembly 14 in direct contact with bodily tissue and / or bodily fluid, and a processing unit 18. The attachment device 16 is generally illustrated in the Figures and described hereinafter as a lead 16, however, other types of devices may be used for positioning the load detection assembly 14. The processing unit 18 is generally illustrated in the Figures as a therapy delivery module, such as a pulse generator, a pacemaker, an implantable cardioverter defibrillator, a defibrillator, and the like. As will be described in more detail below, the load detection assembly 14 detects or senses a force or pressu...
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An implantable lead includes a lead body, having a distal end and a proximal end, configured to be implanted in a patient, and a connector provided at the proximal end. A load detection assembly is provided on the lead body, wherein the load detection assembly includes a housing that holds a sensor and a load transfer element. The load transfer element engages the sensor and conveys a force induced on the load transfer element to the sensor. Optionally, the housing may isolate the sensor from lateral forces and the load transfer element may only convey, to the sensor, longitudinal forces that are directed in a predetermined single direction. For example, the load transfer element may only convey, to the sensor, longitudinal forces that are directed perpendicular to a surface of the sensor.
Description
BACKGROUND OF THE INVENTION[0001]The various embodiments described herein generally relate to implantable leads, and more particularly to implantable leads used for measuring pressure of fluids or tissues within a patient's body.[0002]Pressure tracking of fluids or tissue within a patient's body is useful for predicting pathological conditions of the patient. For example, coronary pressure tracking of the blood within the heart and / or the heart tissue is useful for predicting heart diseases that may lead to heart failure. Several types of pressure sensors, used in connection with an implantable medical device (IMD), have been used to measure coronary pressure.[0003]One known type of pressure sensor utilizes strain gauges to measure pressure. These known sensors include wires that are adhered to a surface of the heart. An electrical potential is maintained across the wires and a change in resistance of the wires is measured. The change in resistance correlates to an amount of extensi...
Claims
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Login to View More IPC IPC(8): A61N1/05
CPCA61B5/0215H01L41/1132A61B5/686A61B5/6869A61B2562/0247A61B2562/0252A61N1/056A61N1/36564H10N30/302
Inventor RODRIGUEZ, RODOLFOKARICHERLA, ANNAPURNA
Owner PACESETTER INC